ABS case and high quality stainless steel shaft, suitable for fresh and sea water and ideal for use with nutrient salts.Inbuilt flow regulator to control flow easily Mounted on suction cups for secure location These pumps are designed for continuous use Low water level/internal multi functional immersible pump can provide powerful water circulation of strong consistent flow below water level.Ideal for indoor fountains,statues fountain,decorative waterfalls, desktop ornaments,pools and aquariums.Also great for use as a draining pump in hydroponic pond. HX-2500 have oxygen mixing function, Hailea Liquid pumps suitable for hydroponics, ponds, tanks and general use, that can work in low water. These versatile little pumps have fully adjustable low rate regulators and have the ability to work in low water conditions.